Originally posted by WPRESTO the loss of back-compatibility of a mirrorless Pentax body with a different lens registration distance would be unacceptable, and that places some restrictions on the size of a FF Pentax mirrorless body = Canon can/did introduce a new lens mount with a shorter lens registration but Pentax cannot.
Without question, Ricoh is in a position of damned if you do, damned if you don't in regards to the K-mount when considering
mirrorless options. Sony mirrorless, et al, shooters already have access to Pentax glass via glassless adapters. A K-mount
mirrorless body would not likely sell to anyone but current Pentax owners. More and more, I think Ricoh would be best served
by adopting a new mount if/when they decide to release a FF mirrorless. Yes, it would be hard on current Pentax shooters but
I do think it would be much more appealing to potential new Pentax customers and much more viable long term.
Next question is Pentax proprietary mount or something universal? I say Ricoh should go L-mount. Straight away the lack
of available lenses largely disappears, including all those Sigma lenses many lust for. To that, Ricoh could:
Make a really cracking good K-mount adapter. Why couldn't an adapter have a built in motor to handle the mechanical
aperture connection? Include that really cracking good K-mount adapter free of charge with new FF mirrorless sales as
an incentive to existing Pentax customers, at least initially.
A more radical approach might be to offer a body with interchangeable mounts modules, not unlike the GXR.
Expensive to design and produce but opens the potential to use almost any mount 'natively'. Pentax could offer
K-mount and L-mount modules, third parties could offer other mount modules.
Another radical option could be to release two identical bodies at the same time, the only difference being the
mount. One K-mount FF mirrorless and one L-mount, then let the buying public decide which way Ricoh should
move forward.
No easy way going forward but we need to ask, just as I'm sure Ricoh is asking itself: If a K-mount DSLR didn't
appeal to the general public before mirrorless, why would a K-mount mirrorless appeal now?